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Alumina


Alumina

Alumina is a synthetically produced aluminium oxide. It is a white or nearly colourless crystalline substance that is used as an engineering ceramic. This material offers high performance that is cost effective. Alumina is made from a naturally occurring ore called bauxite that contains variable amounts of aluminium oxides that contain water. Aluminium oxide occurs naturally as the mineral corundum and as the gemstones sapphire and ruby. Alumina is used to produce these gemstones synthetically. Activated alumina is a porous, granular substance that is used as a substrate for catalysts and as an adsorbent for removing water from gases and liquids. Calcined alumina- aluminium oxide that has been heated at temperatures in excess of 1,050° C to drive off nearly all chemically combined water- is made into a variety of ceramic products such as insulators, bone and dental implants, laboratory ware, sandpaper grits and grinding wheels. Alumina´s properties include low electric conductivity, resistance to chemical attack, high strength, and extreme hardness, making it ideal for the products mentioned above. A stronger grade of alumina can be achieved by modifying it and toughing it with zirconia. Alumina components are manufactured using processes that include pressing, extruding, slip casting and injection molding. Its combination of high thermal conductivity and low thermal expansion imparts good thermal shock resistance.

Applications

  • Furnace tubes
  • High temperature vacuum furnaces
  • Heat treating furnace rollers
  • Radiant tubes
  • Laser tubes
  • Electrical Insulators
  • Ceramic ballistic
  • Ceramic rods
  • Tubes

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